RENTAL PROPERTIES (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	$ 198,520,478
Initial Cost to Partnerships
Land	41,773,766
Building Improvements	150,044,186
Cost Capitalized Subsequent to Acquisition
Improvements	29,680,527
Gross Amount at Which Carried at Close of Period
Land	41,729,573
Building Improvements	179,724,713
Totals	221,454,286	158,624,893	159,123,799
Accumulated Depreciation	68,549,625	63,651,293	60,199,265
Rental Properties
Balance, Beginning	158,624,893	159,123,799	150,818,648
Additions:
Buildings, improvements and other assets	65,349,698	2,360,399	12,444,604
Balance before deductions	223,974,591	161,484,198	163,263,252
Deduct:
Write-off of retired or disposed assets	2,505,787	1,607,830	2,437,555
Rental properties held for sale and/or sold	14,518	1,251,475	1,701,898
Balance, Ending	221,454,286	158,624,893	159,123,799
Accumulated Depreciation
Balance, Beginning	63,651,293	60,199,265	58,074,391
Add:
Depreciation for the year	7,404,120	5,849,083	5,750,989
Total additions	71,844,630	66,048,348	63,825,380
Deduct:
Accumulated depreciation of retired or disposed assets	2,505,787	1,607,830	2,437,555
Accumulated depreciation of rental properties held for sale and/or sold		789,225	1,188,560
Balance, Ending	68,549,625	63,651,293	60,199,265
Buildings and Improvements | Minimum
Gross Amount at Which Carried at Close of Period
Estimated useful lives	10 years
Buildings and Improvements | Maximum
Gross Amount at Which Carried at Close of Period
Estimated useful lives	39 years
Other Categories of Assets | Minimum
Gross Amount at Which Carried at Close of Period
Estimated useful lives	5 years
Other Categories of Assets | Maximum
Gross Amount at Which Carried at Close of Period
Estimated useful lives	10 years
Boylston Downtown L.P. Residential Apartments Boston, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	40,000,000
Initial Cost to Partnerships
Land	2,112,000
Building Improvements	8,593,111
Cost Capitalized Subsequent to Acquisition
Improvements	7,329,225
Gross Amount at Which Carried at Close of Period
Land	2,112,000
Building Improvements	15,922,336
Totals	18,034,336
Accumulated Depreciation	9,643,251
Deduct:
Balance, Ending	18,034,336
Deduct:
Balance, Ending	9,643,251
Brookside Associates LLC Residential Apartments Woburn, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	2,684,432
Initial Cost to Partnerships
Land	684,000
Building Improvements	3,116,000
Cost Capitalized Subsequent to Acquisition
Improvements	489,922
Gross Amount at Which Carried at Close of Period
Land	684,000
Building Improvements	3,605,922
Totals	4,289,922
Accumulated Depreciation	1,755,296
Deduct:
Balance, Ending	4,289,922
Deduct:
Balance, Ending	1,755,296
Courtyard @ Westgate Residential Units Burlington, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	2,000,000
Initial Cost to Partnerships
Land	44,965
Building Improvements	4,478,687
Cost Capitalized Subsequent to Acquisition
Improvements	249,954
Gross Amount at Which Carried at Close of Period
Land	44,965
Building Improvements	4,728,641
Totals	4,773,606
Accumulated Depreciation	1,643,418
Deduct:
Balance, Ending	4,773,606
Deduct:
Balance, Ending	1,643,418
Clovelly Apartments L.P. Residential Apartments Nashua, New Hampshire
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	4,160,000
Initial Cost to Partnerships
Land	177,610
Building Improvements	1,478,359
Cost Capitalized Subsequent to Acquisition
Improvements	1,503,424
Gross Amount at Which Carried at Close of Period
Land	177,610
Building Improvements	2,981,783
Totals	3,159,393
Accumulated Depreciation	2,067,556
Deduct:
Balance, Ending	3,159,393
Deduct:
Balance, Ending	2,067,556
Commonwealth 1137 L.P. Residential Apartments Boston, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	3,750,000
Initial Cost to Partnerships
Land	342,000
Building Improvements	1,367,669
Cost Capitalized Subsequent to Acquisition
Improvements	983,064
Gross Amount at Which Carried at Close of Period
Land	342,000
Building Improvements	2,350,733
Totals	2,692,733
Accumulated Depreciation	1,346,509
Deduct:
Balance, Ending	2,692,733
Deduct:
Balance, Ending	1,346,509
Commonwealth 1144 L.P. Residential Apartments Boston, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	14,780,000
Initial Cost to Partnerships
Land	1,410,000
Building Improvements	5,664,816
Cost Capitalized Subsequent to Acquisition
Improvements	1,764,516
Gross Amount at Which Carried at Close of Period
Land	1,410,000
Building Improvements	7,429,332
Totals	8,839,332
Accumulated Depreciation	4,550,902
Deduct:
Balance, Ending	8,839,332
Deduct:
Balance, Ending	4,550,902
Condominium Units-Riverside Residential Units Massachusetts
Initial Cost to Partnerships
Land	23,346
Building Improvements	190,807
Cost Capitalized Subsequent to Acquisition
Improvements	19,564
Gross Amount at Which Carried at Close of Period
Land	23,346
Building Improvements	210,371
Totals	233,717
Accumulated Depreciation	204,818
Deduct:
Balance, Ending	233,717
Deduct:
Balance, Ending	204,818
Executive Apartments L.P. Residential Apartments Framingham, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	2,415,000
Initial Cost to Partnerships
Land	91,400
Building Improvements	740,360
Cost Capitalized Subsequent to Acquisition
Improvements	700,459
Gross Amount at Which Carried at Close of Period
Land	91,400
Building Improvements	1,440,819
Totals	1,532,219
Accumulated Depreciation	1,093,190
Deduct:
Balance, Ending	1,532,219
Deduct:
Balance, Ending	1,093,190
Hamilton Battle Green LLC Residential Apartments Lexington, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	4,813,616
Initial Cost to Partnerships
Building Improvements	8,457,497
Cost Capitalized Subsequent to Acquisition
Improvements	80,805
Gross Amount at Which Carried at Close of Period
Land	1,341,737
Building Improvements	8,538,302
Totals	9,880,039
Accumulated Depreciation	1,009,136
Deduct:
Balance, Ending	9,880,039
Deduct:
Balance, Ending	1,009,136
Hamilton Cypress LLC Commercial-1031Exchange Brookline, Massachusetts
Initial Cost to Partnerships
Land	2,362,596
Building Improvements	4,613,985
Cost Capitalized Subsequent to Acquisition
Improvements	348,345
Gross Amount at Which Carried at Close of Period
Land	2,362,596
Building Improvements	4,962,330
Totals	7,324,926
Accumulated Depreciation	876,537
Deduct:
Balance, Ending	7,324,926
Deduct:
Balance, Ending	876,537
Hamilton Green Apartments Residential Apartments Andover, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	38,500,000
Initial Cost to Partnerships
Land	16,054,336
Building Improvements	44,794,438
Cost Capitalized Subsequent to Acquisition
Improvements	125,362
Gross Amount at Which Carried at Close of Period
Land	16,054,336
Building Improvements	44,919,800
Totals	60,974,136
Accumulated Depreciation	1,534,867
Deduct:
Balance, Ending	60,974,136
Deduct:
Balance, Ending	1,534,867
Hamilton Linewt LLC Commercial-1031Exchange Newton, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	1,474,947
Initial Cost to Partnerships
Land	884,042
Building Improvements	2,652,127
Cost Capitalized Subsequent to Acquisition
Improvements	50,608
Gross Amount at Which Carried at Close of Period
Land	884,042
Building Improvements	2,702,735
Totals	3,586,777
Accumulated Depreciation	422,799
Deduct:
Balance, Ending	3,586,777
Deduct:
Balance, Ending	422,799
Hamilton Oaks Associates LLC Residential Apartments Brockton, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	11,925,000
Initial Cost to Partnerships
Land	2,175,000
Building Improvements	12,325,000
Cost Capitalized Subsequent to Acquisition
Improvements	1,898,324
Gross Amount at Which Carried at Close of Period
Land	2,175,000
Building Improvements	14,223,324
Totals	16,398,324
Accumulated Depreciation	7,684,626
Deduct:
Balance, Ending	16,398,324
Deduct:
Balance, Ending	7,684,626
Highland Street Apartment, L.P. Residential Apartments Lowell, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	1,050,000
Initial Cost to Partnerships
Land	156,000
Building Improvements	634,085
Cost Capitalized Subsequent to Acquisition
Improvements	387,455
Gross Amount at Which Carried at Close of Period
Land	156,000
Building Improvements	1,021,540
Totals	1,177,540
Accumulated Depreciation	592,810
Deduct:
Balance, Ending	1,177,540
Deduct:
Balance, Ending	592,810
Linhart L.P. Residential/Commercial Newton, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	1,929,123
Initial Cost to Partnerships
Land	385,000
Building Improvements	1,540,000
Cost Capitalized Subsequent to Acquisition
Improvements	1,239,887
Gross Amount at Which Carried at Close of Period
Land	385,000
Building Improvements	2,779,887
Totals	3,164,887
Accumulated Depreciation	1,845,936
Deduct:
Balance, Ending	3,164,887
Deduct:
Balance, Ending	1,845,936
NERA Dean St. Associates LLC Residential Apartments Norwood, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	5,113,360
Initial Cost to Partnerships
Land	1,512,000
Building Improvements	5,701,480
Cost Capitalized Subsequent to Acquisition
Improvements	561,752
Gross Amount at Which Carried at Close of Period
Land	1,512,000
Building Improvements	6,263,232
Totals	7,775,232
Accumulated Depreciation	2,685,523
Deduct:
Balance, Ending	7,775,232
Deduct:
Balance, Ending	2,685,523
North Beacon 140 L.P. Residential Units Boston, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	6,937,000
Initial Cost to Partnerships
Land	936,000
Building Improvements	3,762,013
Cost Capitalized Subsequent to Acquisition
Improvements	1,588,914
Gross Amount at Which Carried at Close of Period
Land	936,000
Building Improvements	5,350,927
Totals	6,286,927
Accumulated Depreciation	3,295,988
Deduct:
Balance, Ending	6,286,927
Deduct:
Balance, Ending	3,295,988
Olde English Apartments L.P. Residential Apartments Lowell, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	3,080,000
Initial Cost to Partnerships
Land	46,181
Building Improvements	878,323
Cost Capitalized Subsequent to Acquisition
Improvements	1,252,182
Gross Amount at Which Carried at Close of Period
Land	46,181
Building Improvements	2,130,505
Totals	2,176,686
Accumulated Depreciation	1,374,075
Deduct:
Balance, Ending	2,176,686
Deduct:
Balance, Ending	1,374,075
River Drive L.P. Residential Apartments Danvers, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	3,465,000
Initial Cost to Partnerships
Land	72,525
Building Improvements	587,777
Cost Capitalized Subsequent to Acquisition
Improvements	729,271
Gross Amount at Which Carried at Close of Period
Land	72,525
Building Improvements	1,317,048
Totals	1,389,573
Accumulated Depreciation	926,978
Deduct:
Balance, Ending	1,389,573
Deduct:
Balance, Ending	926,978
Redwood Hills L.P. Residential Units Worcester, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	6,743,000
Initial Cost to Partnerships
Land	1,200,000
Building Improvements	4,810,604
Cost Capitalized Subsequent to Acquisition
Improvements	2,285,268
Gross Amount at Which Carried at Close of Period
Land	1,200,000
Building Improvements	7,095,872
Totals	8,295,872
Accumulated Depreciation	4,190,382
Deduct:
Balance, Ending	8,295,872
Deduct:
Balance, Ending	4,190,382
School St Assoc LLC Residential Apartments Framingham, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	15,000,000
Initial Cost to Partnerships
Land	4,686,728
Building Improvements	18,746,911
Cost Capitalized Subsequent to Acquisition
Improvements	(1,997,252)
Gross Amount at Which Carried at Close of Period
Land	4,686,728
Building Improvements	16,749,659
Totals	21,436,387
Accumulated Depreciation	6,647,588
Deduct:
Balance, Ending	21,436,387
Deduct:
Balance, Ending	6,647,588
Staples Plaza Strip Mall Framingham, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	6,000,000
Initial Cost to Partnerships
Land	3,280,000
Building Improvements	4,920,000
Cost Capitalized Subsequent to Acquisition
Improvements	46,847
Gross Amount at Which Carried at Close of Period
Land	3,280,000
Building Improvements	4,966,847
Totals	8,246,847
Accumulated Depreciation	2,403,966
Deduct:
Balance, Ending	8,246,847
Deduct:
Balance, Ending	2,403,966
WCB Associates LLC Residential Apartments Brockton, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	7,000,000
Initial Cost to Partnerships
Land	1,335,000
Building Improvements	7,565,501
Cost Capitalized Subsequent to Acquisition
Improvements	1,017,996
Gross Amount at Which Carried at Close of Period
Land	1,335,000
Building Improvements	8,583,497
Totals	9,918,497
Accumulated Depreciation	4,756,907
Deduct:
Balance, Ending	9,918,497
Deduct:
Balance, Ending	4,756,907
Westgate Apartments LLC Residential Apartments Woburn, Massachusetts
Real estate and accumulated depreciation
Encumbrances (First Mortgages)	15,700,000
Initial Cost to Partnerships
Land	461,300
Building Improvements	2,424,636
Cost Capitalized Subsequent to Acquisition
Improvements	7,024,635
Gross Amount at Which Carried at Close of Period
Land	417,107
Building Improvements	9,449,271
Totals	9,866,378
Accumulated Depreciation	5,996,569
Deduct:
Balance, Ending	9,866,378
Deduct:
Balance, Ending	$ 5,996,569